RedHat command line and graphical interface Switch

RedHat command line and graphical interface Switch

1. switch between the Linux GUI and command INTERFACE

The RedHat Linux system is installed in the virtual machine. By default, the graphic interface is displayed.

You can press Ctrl + Alt + Fn (n = 1, 2, 3, 4, 5, 6) to switch from the Linux GUI to the command interface, but Ctrl + Alt has been occupied in the virtual machine, that is, the cursor switches out of the VM. Therefore, press Ctrl + Shift + Alt + Fn (n = 1, 2, 3, 4, 5, 6 ). (What about Shenma? By default, the graphic interface is started. Press Ctrl + Alt + Fn (, 6) to enter the command line, and press Ctrl + Alt + F1 to return to the graphic interface)

Switch from the Linux Command interface to the graphic interface. You can press Alt + F7 (or enter the startx command to enter the graphic interface ).

You can modify the configuration file if you want to enter the command interface by default. The specific command is as follows (in the command interface, of course, it must be root or a user name with root permission ):

(1) vi/etc/inittab -- use the vi editor to edit the/etc/inittab File

(2) switch to INSERT mode by pressing I, that is, modify the mode.

(3) Find the line init: 5: initdefault in the file and change 5 to 3. What does 5 and 3 represent?

(4) Press Esc to exit INSERT mode

(5) Press: (colon) -- The cursor is locked to the last line.

(6) wq (save and Exit)

If you do not want to modify it, q! (Exit without saving)

Restart to enter the command interface by default.

2. Linux running level

Linux has 7 running levels: init [0123456]

0: Shutdown

1: Single User

2: No network service in multi-user status

3: Multi-User Network Services

4: The system is not used and retained to the user.

5. Graphic Interface

6. Restart

The commonly used running levels are 3 and 5. to modify the running level, you can modify them in the file/etc/inittab. For details about how to modify the running level, refer to "1" to enter the interface by default.

If it is set to 1, it will shut down and set to 6, it will be restarted all the time.

3. Solution to modifying incorrect configurations

If you are not careful, set the running level to 1 or 6 and cannot enter Linux normally, you can follow the methods below. (Of course, when GRUB does not have a password)

(1) when the system is being started for several seconds, press "e" to enter the GRUB boot Interface

(2) Highlight the second line and enter "e" to enter

(3) Enter "1" [single-user level], because the/etc/inittab file is not read at single-user level startup.

(4) Press enter to return to the GRUB interface.

(5) Press "B" to enter the single-user mode.

(6) in single-user mode, modify the/etc/inittab file according to 1.

Because you do not need to enter the original password to change the password in Linux, you can also change the password in single-user mode if you forget the password.